The most recent Infinite Monkey Cage (22Mb mp3 - about 30mins long) has Cox and NdGT discussing stability of worm holes and the possibility of using them for time travel or to break causality etc. Worth a listen, especially if you've never seen heard this show before.

So is this guy claiming that the faster you go forward in space, the faster you go in time? So, all you have to do is repeat what has been known sense Einstein's time, and you're considered worthy of writing about?

Oh, he also spoke about stable wormholes and completely unknown (super-natural) energies.

Honestly, this is something that any respectable first year college physics student would be able to tell you. The reason backwards time travel isn't possible is because it would require travelling faster than the speed of light, which remains theoretically impossible. An infinite amount of energy is required to accelerate an object to the speed of light, making it impossible to reach, let alone go any faster.

Hmm, OK. Didn't read the article, but i assume he's talking about special relativity here, and twin paradox is used often to illustrate this: one twin stays on Earth, the other goes off in a spaceship. When the spaceship twin returns, he's only aged a little while everyone else is old or dead. Thus, the spaceship twin has "travelled into the future!"

As Calvin once demonstrated in a classic strip, if you mail a letter to yourself, the delivery time ensures you'll be mailing it to your future self.

Try this, but save the return address. Now you'll know where to send information to your past self, and you can send back winning lottery numbers, hot stock tips, and the lowdown on upcoming mistakes to be avoided! You'll be living on easy street and always make the right move!

/ah sh*t. I should have charged a fee before revealing that amazing metaphysical discovery. Excuse me while I go mail a correction notice to my previous self.

Dedmon:So is this guy claiming that the faster you go forward in space, the faster you go in time? So, all you have to do is repeat what has been known sense Einstein's time, and you're considered worthy of writing about?

Oh, he also spoke about stable wormholes and completely unknown (super-natural) energies.

I assume this has to do with the Science of Doctor Who program he's presenting for the fiftieth.

The future at least seems technically feasible to me. (Insofar as the fact the the physical concept of time differs from the human physiological concept of time.)

The past however,is tougher. As there is infinite time ahead of us, if time travel to the past was possible would we not have some evidence? This actually becomes a subjective topic as one must decide if future civilization(s) would be motivated to come back in time to anywhere before the present.

So if time travel backwards is or will be possible then Hitler was not even terrible enough to send someone or something back to 1889 to correct such an aberration

FTA:Cox pointed out this little trick of physics at a speech at the British Science Festival while discussing the merits of Doctor Who's TARDIS, but it probably isn't news to anyone with a basic knowledge of how Einstein's theory of Special Relativity works.

Yep, old news indeed. Travel near the speed of light and your "time" slows down. Or you can just park your spaceship near a singularity (black hole). Just a rehash of old stuff.

chocolate covered poop:The future at least seems technically feasible to me. (Insofar as the fact the the physical concept of time differs from the human physiological concept of time.)

The past however,is tougher. As there is infinite time ahead of us, if time travel to the past was possible would we not have some evidence? This actually becomes a subjective topic as one must decide if future civilization(s) would be motivated to come back in time to anywhere before the present.

So if time travel backwards is or will be possible then Hitler was not even terrible enough to send someone or something back to 1889 to correct such an aberration

Here's the thing about changing the past: no one would know. Likely, the 'you' that traveled back to change things would cease to exist due to quantum fluctuation, to say nothing of the position of every atom, molecule, and string that composes the universe. Sure, you can travel back 75 years. Better hope you calculated for all that stuff I mentioned, otherwise, you're likely to end up inside the Earth's crust, at best. Likewise any 'instantaneous' travel to the future. Perhaps there is a way to 'observe' past or future events. Actually, we already do,just look at the night sky and BINGO! you're looking at something from a million years ago (in some cases). Now, observing FUTURE events, that's where it gets tricky...

chocolate covered poop:The future at least seems technically feasible to me. (Insofar as the fact the the physical concept of time differs from the human physiological concept of time.)

The past however,is tougher. As there is infinite time ahead of us, if time travel to the past was possible would we not have some evidence? This actually becomes a subjective topic as one must decide if future civilization(s) would be motivated to come back in time to anywhere before the present.

So if time travel backwards is or will be possible then Hitler was not even terrible enough to send someone or something back to 1889 to correct such an aberration

It's possible it's possible but each 'travel' event creates a new universe in which those changes take place. So, since it was/will be invented in this universe...you can travel from here, but not to here.

Or it's just not possible. (And...it's just not possible based on everything we know about the universe. No time travel. Not yours.)